angular.module('ngDebounce', []).config ['$provide', ($provide) ->
    $provide.decorator '$timeout', ['$delegate', '$q', ($delegate, $q) ->
        $delegate.debounce = (func, wait, immediate) ->
            timeout = undefined
            deferred = $q.defer()
            (->
                context = this
                args = arguments
                later = ->
                    timeout = null
                    unless immediate
                        deferred.resolve func.apply(context, args)
                        deferred = $q.defer()

                callNow = immediate and not timeout
                $delegate.cancel timeout  if timeout
                timeout = $delegate(later, wait)
                if callNow
                    deferred.resolve func.apply(context, args)
                    deferred = $q.defer()
                deferred.promise)
        return $delegate
    ]
]